Integrated Services Q0S

Posted by AJ × 07:54

* IntServ or integrated services is an architecture that specifies the elements to

guarantee quality of service (QoS) on networks.

* IntServ specifies a fine-grained QoS system, which is often contrasted with DiffServ's

coarse-grained control system.

* The idea of IntServ is that every router in the system implements IntServ, and

every application that requires some kind of guarantees has to make an individual

reservation.

* Integrated services approach consists of two service classes

1. Guaranteed service class: - defined for applications that cannot tolerate

a delay beyond particular value. Real time applications like voice or video

communications use this type of service

2. Controlled-load service class:- defined for applications that can tolerate some

delay and loss.

The below figure shows four processes providing quality of service

1. Traffic shaping :-It regulates the traffic

2. Admission control: - It governs the network by admitting or rejecting the application

flow.

3. Resource allocation:- It allows the network users to reserve the resources on

neighboring routers

4. Packet scheduling: - sets the timetable for the transmission of packet flows.

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